Metallurgical furnace.



U. WEDGE.

METALLURGICAL FURNACE.

APPLICATION FILED FEB. 13, 1911.

Patented Apr. 29, 1913.

iNVE NTOR LEY WEDGE l5 ATTORNEY rr r rarer 'FFEQE,

UTLEY WEDGE, or AImMoaE, PENNSYLVANIA, assrenon To THE FURNACE PATENT COMPANY, or rmnannnrnm, PENNSYLVANIA, A coaronarron or PENNSYL- VANIA.

,METALLURGICAL memes.

Patented Apr. as, 1913.

Application filed February 13, 1911. Seria1'No. 608,338.

To all whom it may concern Be it known that I, UTLEY Wnncn, a citizen of the United States, residing in Ardmore, Montgomery county, Pennsylvania, have invented certain Improvements in Metallurgical Furnaces, of which the following is a specification.

y allurgioal furnaces which have superposed hearths and working chambers, the'hearths havin therein openings through which the materlal under treatment drops from each hearth to the hearth beneath, suitable stirring and feeding devices in each working chamber causing the material to pass over the hearths from one set of openings to the other. Usually in this type of furnace the gases pass upwardly from each treating chamber to that above it through the same openings which serve for the passage of the material under treatment from each hearth to that below it, with the result that fine particles of material are carried off in the form of dust by the gases, thereby not only of material but also clogging causing waste fines or passages provided for with dust the the escape of the gases, gases to carry the dustwith them into the apparatus in which they may be subsequently treated, where such dust is objectionable.

The object of my present invention is to so construct. a furnace of the type referred to as toprovide for the passage of the gases from chamber to chamber of the furnace through channels or ducts independent of those through which the material is fed downwardly from'chamber to chamber, the

respective passages for the upward flow of gas and downward flow of material being relatively remote in order to remove, as far as possible from the influence of the rising currents of gas, the dust created by the falling of the powdered material from one hearth to another.

In the accompanying drawings-Figure in vertical section, sufficient of a furnace of the type to which my invention relates to illustrate my present invention, and Fig. 2- is a horizontal sectional view on the line a/-a, Fig. 1.. i I

In the drawings, 1 represents the outer wall of the furnace, 2 the successive hearths of the same, 3 the successive working chambers, and 4 the roof which may be provided invention relates to that type of-met-- or permitting said with any of the mg the ore or other material 'to be treated onto the upper hearth of the furnace. In each hearth are formed openings 5 for the downward passage of material from said hearth onto the hearth below it, these openlngs being arranged alternately at the outer and inner portions of the hearths, and the furnace-having a central shaft 6 which carrles arms having rabbles or equivalent stirring and feeding devices whereby the material is fed either inwardly or outwardly over each hearth from the point at which it is deposited thereon to the point at which it is discharged therefrom.

In the drawings, 7 represent the openings in the shaft 6 for the reception of the rabble carrying arms, similar openings being formed in the refractory covering 9 with which the shaft is usually provided in'order to protect it from the heat of the furnace.

Built intdthe' outer wall 1 of the] furnace are a plurality of boxes or casings 10, each of which contains a channel or duct 11 providing communication between one of the working chambers 3 of the furnace and the working chamber above it, hence the-number of horizontal sets or rows of these casings will be dependent upon the number of superposed working chambers in the furnace,

there being in the present instance but two horizontal rows or sets of such casings. The number of casings in each horizontal row orset may be varied according to circumstances, but it is preferable to have as many casings in each set as there are delivery openings 5 in the hearth of the furnace, the casings being disposed midway of the delivery openings, as shown in Fig. 2, so as to occupy a position as remote as possible therefrom, whereby the current of the gases ascending through eachlduct or channel 11 will exert a minimum efiect upon the dust rising'from the stream of material falling through the adjacent delivery openings 5. Each of the casings 10 has, in its lower portion, an inclined partition or false bottom 12 which'presents an angle greater than the angle of repose of a body of powdered or granular material, so that any dust which may fall from the current of gases rising through the duct or channel 11 will be defiected by said false hearth below and will be removed by the stirring and feeding devices cooperating customary means for icedbottom 12 onto the v with said hearth. he casings 10 are preferably built into the wall of the furnace and extend through. the same so that they are accessible from the outside of the furnace and can be readily removed and replaced With new ones when they become burned out or otherwise defective.

I claim:

1. A furnace having side Walls and superposed hearths providing superposed working chambers, said hearths having openings therethrough for the downward passage of the material which is being operated upon,

and said side walls having inserted flue casings containing draft channels and so located as to divert the draft from the passages for the downward flow of the material, said casings extending through the vwall so as to be accessible from the outside of the same.

2. A furnace having side walls and superposed hearths providing superposed working chambers, said hearths having openings therethrough for the downward passage of the material which is being operated upon, and said side walls having inserted flue casings containing draft channels and so located as to divertthe draft from the passages for the downward flow of the ma terial, said flue casings having bottoms inclined at an angle. greater than the angle of repose for deflecting into a lower working chamber the material deposited upon them and said casings alsoextending through the walls so as to be accessible from the outside of the same. a

In testimony whereof, I have signed my name to this specification. in the presence of two subscribing witnesses.

. UTLEY WEDGE. Witnesses: I

C. A. usting HARRY L. SMITH. 

